In the Magic Mirror Shop you can buy cherry blossoms for the spring time mission pass.
Protip: that's a waste of currency. Blossoms from missions and paradice should be enough to get everything.
Event lasts for 35 days, you need 350 to get everything, that's 10 per day. roll your moa dice, do your world boss attempts, you'll be fine
Also it’s pretty likely the next event will have some new ways to earn them
I agree with other commenters, you should be getting enough from moa dice to get you through the event.I'd say save your currency for the other items specially since the spring event is much much longer than the world boss